Personal Digital Assistants. Palmtop devices used to store data for immediate reference. Made popular by such brands as Visor and Palm Pilot.

Personal Data Assistant. Handheld computer device.

Personal Digital Assistant, a handheld device used to manage datebooks, to do lists and other data.

Personal digital assistant, or PDA; a device such as a Palm (tm) onto which you can load PatientKeeper software. Also known as a "handheld."

Patent ductus arteriosus. A congenital defect in which the opening between the aorta and the pulmonary artery does not close after birth.

Patent ductus arteriosus. Heart problem that is seen most commonly in premature babies.

Patent ductus arteriosus. A condition in which the ductus arteriosus fails to close shortly after birth. This results in a significant right to left shunt of blood. Babies with this condition often develop heart and lung failure. Treatment with drugs (indomethacin) is possible, and surgical ligation is often necessary.

Posterior descending artery